- on Test & Measurement
- Published in issue 3/2004 on page 0
Voltage & Continuity Tester
for direct and alternating voltages up to 60 V
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CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.
R1 = 1MOhm
R2 = 1kOhm
D1 = LED, low current, red
T1,T2 = BC547C, BC548C or BC549C
BZ1 = miniature piezo transducer (passive)
K1 = 2-way pinheader, lead pitch 2.5mm (0.1 in) or two solder pins
S1 = single-pole changeover switch (optional, see text)
Battery holder for two LR03 (AAA) or LR6 (AA) batteries
Enclosure: suitable metal tube (see text)
PCB, available from The PCBShop